Furnace.



UNITED STATES v PATENT I Orrics.

ALFRED B. WALKER, OF CINCINNATI, OHIO, ASSIGN OR TO FRANK XV. \VILSl-IIRE, OF SAME PLACE.

. FURNACE SPECIFICATION forming part Of Letters Patent No. 674,129, dated May 14, 1901. Application filed April 28, 1900-- berial No- 14 8 65. (No model.)

To an whom it may concern:

Be it known that I, ALFRED B. WALKER, a citizen of the United States, residingat Cincinnati, in the county of Hamilton and State partly in section, of Fig. -1 with the feed-hog.

of Ohio, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

My invention relates to that class of furnaces which employ an endless-belt grate.

One object of my invention is to improve the general construction of the furnace, so as to secure a perfectcombustion, and also to provide a construction of the furnace that coke, hard coal, or bituminous coal may-be completely consumed in the same and with out producing smoke.

Another object of my invention is to provide an improved chain of endless grate-bars, each of which will revolve slowly in its action, soas to prevent an undueheating of the bars. The various features of my invention will be more fully set forth in the description of the accompanying drawings, forming a part of this specification, in which- Figure 1 is a central vertical section of my improved furnace. Fig. 2 is a front elevation,

per-removed. Fig. 3 is an enlarged side elevation of my improved endless grate-bars and I is driven by a suitable motor.

I the endless grate.

driving mechanism. Fig. 4 is a top plan view of the same. Fig. 5 isa perspective view of one of the links which carry the grate-bars. Fig. 6 isa modification of Fig. 3;

In the drawings, A represents the front wall of the furnace; B, the rear wall; 0, the hopper of the feed-chute, which forms a primary combustion-cham ber. i

1) represents the breast of the chimney.

E represents the endless chain of grate-bars.

F G represent sprocket-drums for propelling the endless-chain grate-bars, one of which H represents air fines or ducts leading through the front wall of the-furnace for supplying air to the air-heating chambenl under J represents the mouth or opening leading from the feed chute into the combustionchamber K.

In order that the grate-bars may not be unduly heated on one side andwarp, I make these grate-hars'hollow and of sufficient size to allow a free circulation of air through them. I also employ the following devices for slowly revolving them in their forum-d travel under the combustion-chamber.

L represents one of the chain-links. In the preferred form of construction there are three of these tubular grate-bars journaling in the side bar ct, which is rigidlysecured to one of the members of thelinks a.

able manner. They are provided with an opening b to receive the teeth on the sprocketdrums, so as to propel the endless chain of grate-bars.

M represents a rack-bar. It is shown in one side of the combustion-chainber.

N represents gear-teeth,preferably cast on the hollow grate-bars atone end. These teeth the tubular grate-bars to revolve as they are propelled forwarc'l along their upper longitu dinal path. The rack-bar may be suspended in Fig. 2 or Fig. 6. l I

0 represents a water-tube which spans the bot-tom of the arch at the month or feed-open ing into the furnace at the heat side thereof, where the arch is subjected to the greatest heat, so as to prevent the bricks from being broken by the contact of the fuel against the arch as it is forced into the furnace by the traveling grate.

Mode of operation: ,The feed-hopper is filled with fuel. Kindling is placed in the mouth J. This kindling is ignited, and the fuel is raised to the regular degree of heatbefore the endless chain grate is set in motion. The incandescent fuel atthe mouth of the coinbustion-chamber is slowly carriedacross' said chamber. The rate of speed of the traveling grate is such that the fuel isnot carried into the combustion-chamber any faster than it is brought into a state of incandescence and l the rear end of the chamber.

The links a Ct are hinged together ina suit- Fig. 2 supported under the jamb M and at engage with those of the rack-bariwhich cause either above or below the grate-bars, as shown is completely consumed by the ti "ie it reaches fuel layer .tgillli'il; the sharp ntokirig-abutlowili be observed that the fuel mow-d out of the bottom of the chute or hopper by means oi the traveling, fuel-bod carrier; the top ol' the n'ienh's 1 I5 I of the arch, lhcrcbyactiug upon l'llUSLituljHSlVU layers of green fuel, serving}. to ,Llll'l'l it over away from the passage J. This insures that the heat will reduce the fuel to an incandescent .stato by the time it has been turned over and over and finally reached the bottom of the chute, so that no green fuel passes in to the chamber K. Thin arch has a stoking function which might be produced in a loss degree with but the single arch formed so as to push-back the top-fuel layer; but the form shown is preferred; 'lhese sharp corheroperform alurther function. They be-.

come highly, heated. 'lheairie drawn through lhe'fnel in the chutcand commingles'thoroughly with the prod ncts liberated therein by the heat in such man neras to make a most perfect mixture. 'lhis mingled gas and air rises to the top and is impinged against those highly-heated sharp abut-moms, which serve,

as it were, also as liiciug-cham born, chemically uniting and igniting the mechanicallyin'lxecl air and can no that these gases literally shoot out into the chamber K through pansagze J in a flame, the color of which mlicates a per foot eombustimi. f lhegz-ises are notall consn med at this point, theyarelpassedovcr the incandescent fuel on the traveling; bed in the oxidizing superheated zone created in chamber K and consumed perfectlytherein. it is obvious that this passing of the products evolved from the green coal in one compare,

ment over the constan(fly-moving incandescent bed in another chamber, where it is nubjccted to the chemical action of highlyheatod air, will burn any smoke lforn'iod.

The process of etching, incident to the management of the furnace aims to-hecp a fresh incandescentfuel-bed'forconsuming the smolce from thegreen fuel. Itiaobvious that my device automatically and perfectly stokes;

the fuel, rendering it impossible to omother the lfncl-bed, thoroughly uniting. the air and gases in a highly-heated stale; and sifting out the ash as fast as it in formed instead oi letting it accumulate and (lumping it at the end of the travel or olhorsiinted intervals, and so giving the most favorable conditions it'ora complete combustion oi luel.

vVhcn (maree-l'uol-is used, a large amount of air will pass into-the furnace through this coarse fuel, and it will be heated before it onters into the combunlion-chamher. The .lll' which enters through the ducts ll becomoe heated in the chamber below the travelii'n, grate, and an it passes between the gratebars it becomes; highly heated and is in proper condit-ion to support the coinbnsition without the cooling of the incandescent gases driven from the Fuel.

substantially as specifiedn owns. 29

in the drawings in shown a large ,coinbun- Hon-chamber above the traveling grates; but this form is not material. It may be adapted to a. .llliiztnhllollbl or to a redu ing, or about iny; furnace, and its form will be \niriously nicdiiicd, accordingto the ones for which it is to be employed. u

Having described my invention, I claim 1. In a furnace, a coinbnsticn-chamber, a traveling grate, a stoning; device above said grate having; ol'fsetsadapted to engage and agitate the fuel presented to it by the traveling grate, and means for operating said grate, substantially as described. v 2. 1 In a furnace cuiplo 'ing' an endless't-ravolingbelt crate driven by drums and located under itlie iced-chute and cornlmstion-chamher, Hflld endless grate being, provided with gratobars and mechanism for revolving the said grate-bare individually as they are propelled forward by the revolution of the drums,

In a furnace employing; an endless traveling grate, a primary chamber and a combimtion-chamber located above said grate and communicating with each other, an arch downvirardiy inclined in the direction of the movement of the grate, provided with a series of offsets, and means for revolyin iid grate, substantially as a ml for the pn rpote specified.

4:. In a furnace the combination with the drums and an endlenri traveling chain grate propelled by the same, said chain gralte composed of links having plate extensions in which are jonrnaled hollow ntantiallyas specified.

5. in a furnace, the combination of an endless-chain grate, suitable drums engaging and propell'ny; said chain, revolving grate-bars journalcd in the chain-links and provided with gear-teeth meshing with a rack-bar in the furnace whereby the grate-bare are con- 'iin uousl y revolved as they progressively move throngh the furnace, substantially as specified.

(J. In a furnace, the combination of a prigrate-bars, siib-.

Ipo

1 I Ci 'ma-ry chamber, and a combnotion-chamber lo 1 outed over a traveling grate, a sticking device forming the partition between said compartment and chamber and adapted to'crowd back the top layers of fuel into saidfecdingcompai'tinent, and means for supplying air to said coiarbitration-chamber, substantially as spoolfled.

' '7. in a furnace employinga traveling grate, the combination of a primary chamber and a combuetion chamber located over said grate, a partition between said chainbers'furminga passage n nder tho pz'irtition onc or more stoking; devices formed on the face of said partition in the clintechamber, and means .for

substan tially feeding air to the combnstion-chmnher, and

In u-llllhmflf, 1.110 con'inhmtion of ffieed- I plying air thereto and revolving .sai i grate, Chillllbfll'thd l (.(HHUUSli()ll-flhfllllbl',lY'GYOIV- g substantially as specified. r inggmio nmummgjl our-Mums m ndersaidchmu- In testimony whereof I have ho'eun to set her, menus fur passing the ais'h through said, my hand. 1, r grate (luring its travel, :1 stoking pm'lrit'ir'nrI ALFRED. WVALKE-Ih. lieLwcen mid vh.-1.mhi,u's' over thegrzyte fi rm- I Witnesses: 

